Abstract
Granites intrusive into basic volcanic rocks in the Red Lake area are commonly surrounded by a zone of rocks intermediate in composition between the granite and the volcanic rocks. Inclusions of varying color contrast are abundant in the granite. Study of a specific example, by means of variation diagrams and petrographic observations, leads to the conclusion that the intermediate rocks are the product of contamination of the granite magma by numerous fragments of country rocks. The contamination resulted in final-stage activity of potash-rich solutions.
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